chore: gitignore docs/ (agent-generated *.md kept local-only)

Author: aksOps

.gitignore

@@ -6,3 +6,8 @@
 # memup runtime data is per-user, never tracked from the dev clone
 .memup/local/
 *.onnx
+
+# Agent-generated *.md (specs, plans, brainstorm intermediates) — kept local-only
+# per the project's authoring-process rules; restorable from `backup-pre-squash`
+# branch on the maintainer's machine if needed.
+/docs/